The diagram shows a d.c. motor. Which two changes, when made together, will always cause the coil to rotate more slowly?
- ADecrease the current in the coil and use a magnet of less strength.
- BDecrease the current in the coil and increase the number of turns on the coil.
- CIncrease the current in the coil and use a magnet of less strength.
- DIncrease the current in the coil and decrease the number of turns on the coil.